參數(shù)資料
型號: 5962R0722402VYC
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: SPECIALTY MICROPROCESSOR CIRCUIT, PQFP256
封裝: QFP-256
文件頁數(shù): 120/155頁
文件大?。?/td> 4139K
代理商: 5962R0722402VYC
AT697F PRELIMINARY INFORMATION
67
7703D–AERO–12/09
PR
ELI
MINA
R
Y
IN
FOR
M
AT
IO
N
If not programmed by software, the baud rate will be automatically be discovered. This is done
by searching for the shortest period between two falling edges of the received data (correspond-
ing to two bit periods). When three identical two-bit periods has been found, the corresponding
scaler reload value is latched into the reload register, and the DSUUC
BL bit is set . If the
DSUUC BL is reset by software, the baud rate discovery process is restarted. The baud-rate
discovey is also restarted when a ‘break’ is received by the receiver, allowing to change to
baudrate from the external transmitter. For proper baudrate detection, the value 0x55 should be
transmitted to the receiver after reset or after sending break.
The best scaler value for manually programming the baudrate can be calculated as follows:
scaler =
sdclk frequency x 10
baudrate x 8
5
10
Booting from DSU
By asserting DSUEN and DSUBRE at reset time, the processor will directly enter debug mode
without executing any instructions. The system can then be initialised from the communication
link, and applications can be downloaded and debugged. Additionally, external (flash) PROMs
for standalone booting can be re-programmed.
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